Among traditional public schools in the Philadelphia-area five-county region, Chester-Upland School District had the highest percentage of its teachers leave per year on average for the school years 2019-20, 2020-21 and 2021-22, which was calculated by adding the percentage of teachers who went to another district with those who left teaching in a Pennsylvania public school altogether. While teacher turnover isn't a new problem, filling the additional vacancies created has become more difficult.